What they fail to understand is that online streaming is not easy. Netflix and Hulu have invested a lot of resources into their tech stacks. Also, have you tried building an app that works on all the different streaming devices out there? It's annoyingly difficult. You have to do all that, keep up with the latest technologies (e.g. 4K), and still provide unique features and value. Storing the content is the easiest part.
Point is, media companies should stick to what they do best and let the likes of Netflix, Hulu, and Amazon do what they do best.